After doing a series of compression tests with my crappy HF model comp tester, I am repeatedly surprised by the amount carbon that has built up on them after just a short run (5-10 min or a 1/2 mile city).

I know they are in the PC and diesel is shot right past them then burnt very quickly, but does this build up over time? How much is normal?

the car does alot of sitting, there was a bacterial infection recently but Startron cured that and it is still in the tank.

compression results hover just under 400 psi across the board.

I also dropped one!! How resilient are they (Bosch France model)?

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Pictures are worth a thousand words.

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

Compression sounds good. I would not worry about the carbon, it's dirty in the combustion chamber. Compression is excellent. FWIW My HF compression tester goes into the fuel injector hole.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

Yeah.. that's what the instructions say. You can rig it otherwise, however. I am pretty new to this and have yet to pull my injectors, I don't have extra crush washers lying around and it seems like a big hassle to pull them. Just felt more comfortable w/ the GP hole.
hopefully that has nothing to do personal preferences.

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you dont allways have to replace the crush washers, sometimes you get lucky. I allways reused the old ones never had one leak yet.

__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.